Online leap year calculator, quickly verify whether a year is a leap year, and list all leap years within a specified range, which is convenient for date query and planning.
Online conversion of C series paper sizes (C0-C10) to pixel (PX) width and height based on DPI/PPI.
Online inquiry for Chinese standard D-series paper sizes, providing a millimeter width-height comparison table, an essential tool for design and printing.
Personalized target heart rate calculator, helping you exercise scientifically based on age, resting heart rate, and fitness level.
Conveniently calculate key memorial dates such as the First Seven, Third Seven, Fifth Seven, and Seventh Seven for the deceased, supporting Lunar and Gregorian calendar input, aiding in the preservation of traditional customs and the expression of grief.
Calculate sine, cosine, tangent, and other trigonometric function values online, supporting radian input and decimal place settings.
Online jaundice index calculation tool, quickly assesses jaundice status and normal range by entering bilirubin levels and whether it's a newborn.
Quickly calculate ad Cost Per Thousand Impressions (CPM), optimize ad budget, and enhance marketing effectiveness.